申論題

4.(25pt) For the circuit shown in Figure 4, the parameters are: = 0.1 kΩ, R₁ = 40 kΩ, R₂ = 5.72 kΩ, R_E = 0.5 kΩ, Rc = 5 kΩ, and R_L = 10 kΩ. The transistor parameters are: β = 150,  0.7 V, neglect Early effect, Cπ = 35 pF, Cμ = 4 pF, Cc= 1 μF. Thermal voltage V_T = 26 mV. Please determine the lower and upper corner frequency (f_L and f_H), midband gain. (10pt, 10pt, 5pt)